pinctrl: core: Fix lockup when getting pinid, pinctrldev from gpio

pinctrl: core: Fix lockup when getting pinid, pinctrldev from gpio

Remove unnecessary locking from pinctrl_get_pinctrl_dev_pin_id_from_gpio
as pinctrl_get_device_gpio_range already acquires pinctrldev_list_mutex
while traversing the pinctrldev_list.

Change-Id: Ibdc9d535e78ffbee7a629694dc89dd6593767b00
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Reviewed-on: http://git-master/r/539966
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Ishan Mittal <imittal@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>